I have succesfully used Vector fins and F4 fins on my isonics. From Vector works really good the Canefire Carbon and the Volt. From F4 D2 is really good also.
Deboichet is no longer developing fins that I know off and amny of the other brands Remi mention are working wellbut difficult to get your hands on them due to either poor customer service or no interest to selling regular joes like us.